Improvement in clock-escapement



w. o, KELLUM.

Clck Escapement.

No. 83,775. Patented Nov. 3,` 1868.

vWILLIAMAC. KELLUM, or SAN FRANCISCO, CALIFORNIA. Leners Patent No.83,775, cated Nov-mbar 3, 1236s.v

The Schedule referred to in these Letters Patent and making part of thename.

To all whom Iit may concern Be it lmown that I, WILLIAM G. KELLUM, ofthe city and county of San Franeisco,'State of California, have inventedan Improved Escapement for Time Pieces;` and I do hereby declare thefollowing description and accompanyingr drawings are suicient to enableany person skilled in the art 'or science to which it most nearlyappert-ains, to make and use my said invention or improvements withoutfurther invention The object of my invention is to provide an improvedescapement for time-pieces, this improvement consisting in constructinga detent-lever with two arms having lockingsscrews at their ends, saidlever being raised by a bevelled screw, and the extent of itsV falladjusted by a set-screw in a side arm or projection; also, incomindicate like parts. v

Ais the balancesta', standing perpendicularly, and carrying the balanceB. Below the balance on the stal is the roller C, having ,the notches aa' in its periphery, one of which receives an impulse from one set ofteeth in one direction, and the other in the opposite direction from theother set of teeth.

There are two sets of escape-wheel teeth, E E', turning in parallelvertical planes, and attached to the same axisat such a distance apartas to allow the roller to tmnbetween them, and receive an impulse fromeach one alternately. These teeth may be attached to two wheels, asshown in the drawings, or they may be placed on each side of one wheel,and be bent up so as to receive the impulse. v

rIhe detent-lever D is pivoted at b, so as to move freely, and is forkedat the other end, the two branches c c' extending, one on each side ofthe balance-stadc A, and having each an adjustable screw, c e', whichlocks the teeth of the wheels E E alternately.

Upon the bianch* of. the lock-lever is a small adjusting-screw, t',resting on the projection g, by which the screws c e are raised orlowered.

The under part of the lever has a small projecting "adjusting-screw, m,forming a double inclined plane j ust over the roller C. A pin, n,projects upward from the roller, which strikes this plane at eachvibration of the balance, and thus knocks ofthe detent-serews e ealternately, the roller C and balance B receiving an impulse each time.y

The detent may lock by gravitation or by the use of a spring, and theaction is rendered very delicate, while, by means of the detent andadjusting-screws e c and i, the adjustment can be very nicely made.

Haiing thus described my invention,

What I claim, and desired to secure by Letters Patent, is-

1. The detent-lever D, with the locking-screws e c', the adjusting-screwi, and the screw m, combined and arranged substantially asand for the purpose described.

2. In combination'with the pallets aa and the locking-screws or heads cc', the two parallel and symmetrical sets of escape-teeth, E E',arranged and operating .substantially as described.

In witness whereof, I have hereunto set my hand and seal.

WM. C. KELLUM. [L s.] Vltnesses:

O. W. M. SMITH, J. L. BOONE.

